Nanomanufacturing of Vertically Aligned Carbon Nanotube Arrays from Industrial Waste Gas Mixture

利用工业废气混合物纳米制造垂直排列碳纳米管阵列

基本信息

批准号：
1728567
负责人：
Placidus Amama
金额：
$ 29.97万
依托单位：
Kansas State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-09-01 至 2022-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1728567&HistoricalAwards=false
关键词：
Nanomanufacturing Vertically Aligned Carbon Nanotube

项目摘要

Although significant progress has been made in the past two decades in scaling up carbon nanotube manufacture via chemical vapor deposition, the process still faces key challenges such as poor yield due to short catalyst lifetime, low nanotube nucleation density, slow production rate, variations in nanotube properties, resulting in high cost of the nanotubes. Chemical vapor deposition is often plagued by complicated optimization procedures due to the high sensitivity of the growth process to variations in the feedstock composition and flow characteristics. For energy applications that exploit the intrinsic electrical and thermal anisotropy of carbon nanotubes, such as thermal interface materials and battery electrodes, organized nanotube architectures are required to be grown directly on conductive substrates that hardly support growth. This award paves the way for an industrial waste-gas mixture to be used as a feedstock for scalable, low-cost, and continuous manufacture of high-quality carbon nanotube arrays on nontraditional substrates. The use of this feedstock for nanotube growth minimizes the amount of flue gases in oil refineries, thus enhancing environmental protection. The study provides a platform for educating students at many levels, including women and under-represented minorities, on topics related to nanoscience, nanotechnology and nanomanufacturing.The project develops the fundamental understanding required to couple catalytic chemical vapor deposition to the waste stream of Fischer-Tropsch synthesis (FTS) process for scalable and controlled growth of carbon nanotube (CNT) arrays. The project research plan combines reaction engineering through modification of gas-phase chemistry, rational catalyst substrate modification, and advanced ex situ and in situ characterization of catalysts and CNT arrays. The resulting understanding of the roles of the waste-gas mixture and catalyst-substrate interactions in CNT growth enhancement provides a rational basis for optimization and scale-up of CNT growth on nontraditional substrates. Unlike conventional feedstocks that require strict process control and growth rate, area density of CNTs and their quality are generally less sensitive to the fraction of the waste gas during growth, and thus allow for easy optimization and scale-up. The research is expected to contribute in-depth understanding of catalyst-substrate interactions, catalyst evolution under different reaction conditions, and gas-phase chemistries during CNT growth. This study has the distinct possibility of having broad implications in multiple applications, including energy storage and thermal management.

尽管过去二十年来在通过化学蒸气沉积扩大碳纳米管制造方面取得了重大进展，但该过程仍然面临着关键挑战，例如由于催化剂寿命短，纳米管成核密度较低，生产速度缓慢，纳米管特性的变化，纳米管特性的变化，导致纳米管的高成本。化学蒸气沉积通常会受到复杂的优化程序的困扰，因为生长过程对原料组成和流动特征的变化的敏感性很高。为了利用碳纳米管的固有电气和热各向异性（例如热接口材料和电池电极），需要直接在几乎不支持生长的导电基板上生长有组织的纳米管体系结构。该奖项为工业废气混合物铺平了道路，可作为原料，用于在非传统基板上可扩展，低成本和连续制造高质量的碳纳米管阵列。该原料用于纳米管生长的使用可最大程度地减少炼油厂中的烟气气数量，从而增强环境保护。这项研究提供了一个平台，以教育许多层次的学生，包括妇女和代表性不足的少数群体，讨论与纳米科学，纳米技术和纳米制造有关的主题。该项目发展了将催化化学蒸气沉积与Fischer-Tropsch合成（FTS）的浪费相对于级别的carboble-carbon-carbon（CBOUN）的基本理解，以使化学化学蒸汽沉积与浪费。项目研究计划通过修改气相化学，合理的催化剂底物修饰以及先进的原位以及催化剂和CNT阵列的原位表征来结合反应工程。对CNT增长增强中废气混合物和催化剂 - 基底相互作用的作用的最终理解为优化和扩大非传统底物的CNT增长的合理基础提供了理性的基础。与需要严格的过程控制和增长率的常规原料不同，CNT的面积密度及其质量通常对增长过程中废气的比例敏感，从而可以轻松优化和扩大规模。预计该研究将有助于深入了解催化剂 - 基底相互作用，在不同反应条件下的催化剂进化以及CNT生长过程中的气相化学。这项研究具有在包括储能和热管理在内的多种应用中具有广泛影响的明显可能性。